UMG 96-PA / UMG 96-PA-MID / UMG 96-PA-MID+
www.janitza.de
24
WARNING
Risk of injury due to electrical voltage!
Serious bodily injury or death can result from
failure to observe the connection conditions for the
voltage measurement inputs.
Therefore please abide by the following:
·
Switch off your installation before com-
mencing work! Check to be sure it is de-en-
ergized!
·
Connect voltages above the permitted
nominal network voltages via voltage trans-
formers.
·
The voltage measurement inputs on the
device are dangerous to touch!
·
Install a circuit breaker (see section 7.2 on
·
Use a UL/IEC approved overcurrent protec-
tive device with a nominal value rated for the
short circuit current at the connection point.
CAUTION
Malfunction due to improper connection.
Improper connection of the device can result in
incorrect measured values.
Therefore please abide by the following:
·
Measured voltages and currents must origi-
nate from the same network.
·
The device is not suitable for measuring DC
voltage.
7.4 Voltage measurement
There are 3 voltage measurement inputs (V1 to
V3) on the rear of the device.
7.4.1
Overvoltage
The voltage measurement inputs are suitable for
measurement in networks where overvoltages of
category 600 V CAT III (rated surge voltage 6 kV)
can occur.
7.4.2
Frequency
The device:
·Requires the mains frequency for the measure-
ment and calculation of measured values.
·Is suitable for measurement in networks in which
the fundamental oscillation of the voltage is in
the range from 45 Hz to 65 Hz.
The mains frequency is determined from the mea-
sured voltage of phase L1. The sampling frequen-
cy of the voltage and current measurement inputs
results from the mains frequency.
When measuring with strongly distorted volt-
ages, the frequency of the voltage fundamental
oscillation can no longer be determined exactly.
This means that for strongly distorted measured
voltages, the corresponding mains frequency
should have a fixed specification. Voltage distor-
tions occur, for example, during measurements
on consumers that are operated with phase-angle
control. Distortions of the current do not influence
the frequency determination.
Further information can be found in the chapter
„12.4.1 Nominal frequency“ on page 39
Fig.
Connection example for voltage measurement.
L2
L3
N
L1
1)
1)
1)
2)
2)
2)
1.)
Isolation device
(disconnect switch or circuit breaker)
2.)
Fuse
(UL/IEC listed)
